Epson S1F70000 manual 78

S1F76540 Series

Positive Voltage Conversion

The S1F76540 can also boost up a voltage to the posi-

gives a wiring example for three-time positive boosting,

tive potential using external diodes. In such case, how-

and Figure 2.15 provides its electrical potential rela-

ever, the regulator function is unavailable. Figure 2.14

tionship.

D1

D2

D3

C1

+

VO'

1

VO

C2P

16

C2

+

2

VRI

C2N 15

+

3

VREG

C3N 14

4

RV

C1N 13

CO

VDD

5 VDD

C1P 12

+

6

FC

VI 11

7 TC1

10

POFF1

8 TC2

9

CI

POFF2

VI

Figure 2.14 Wiring example of positive voltage conversion (3-time boosting)

◊Setup conditions of Figure 2.14

•Internal clock : ON (Low Output mode)

•Booster circuit : ON

•Regulator : OFF

		3∗ς Φ
	3VI			ς Ο∍
VDD			3VI – (3∗ς Φ)
	VI
VI

Figure 2.15 Potential relationship during positive voltage conversion (3-time boosting)

◊Power-off procedure

•Set the POFF2 pin to low (VI) to turn off all circuits.

◊Two-time boosting

•To boost up a voltage two times, remove capacitor C1 and diode D1 of Figure 2.14, and connect the anode of diode D2 to the VDD pin.

S1F76540 Series

S1F70000 Series Technical Manual

EPSON 2–35